Arata Onozawa defeated Masato Hatanaka 6-2 6-4 in the Japan F1 round of 32 on hard. Arata Onozawa extended the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2010-03-22 | Japan F2 | R32 | hard | Masato Hatanaka | 4-6 6-3 6-0 |
| 2007-10-15 | Japan F10 | R32 | hard | Arata Onozawa | 7-5 1-6 7-5 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.